SMYRNA, WASHINGTON

Period of Record General Climate Summary - Heating Degree Days

Station:(457727) SMYRNA
From Year=1951 To Year=2006
Heating Degree Days for Selected Base Temperature (F)
Base	Jan.	Feb.	Mar.	Apr.	May	Jun.	Jul.	Aug.	Sep.	Oct.	Nov.	Dec.	Annual
65	1050	792	627	377	166	36	5	6	95	403	772	1032	5360
60	895	650	472	235	71	7	1	0	34	260	622	877	4125
57	802	566	380	159	35	2	0	0	16	185	533	784	3461
55	740	509	320	115	19	1	0	0	9	141	474	722	3050
50	586	370	181	38	2	0	0	0	1	59	330	568	2136

Heating Degree Day units are computed as the difference between the base temperature and the daily average temperature. (Base Temp. - Daily Ave. Temp.) One unit is accumulated for each degree Fahrenheit the average temperature is below the base temperature. Negative numbers are discarded. Example: If the days high temperature was 65 and the low temperature was 31, the base 50 heating degree day units is 50 - ((65 + 31) / 2) = 2. This is done for each day of the month and summed.
Table updated on Jul 28, 2006
Months with 5 or more missing days are not considered
Years with 1 or more missing months are not considered

Western Regional Climate Center, wrcc@dri.edu